Zen master bokujuonce lived a zen master bokuju. He used to live inside cave alone most of time. He would sometimes loudly say, "Bokuju" His own name and the himself would say, "Yes, I am here."He would this anytime, day or night. There were some disciples who used to follow him. They would hear this. Disciples were not able to understand it's reason. So, one day one of his disciple asked him, "Why do you call your own name and then reply yourself to this."Bokuju replied, "Wherever I get into thinking, I have to remember myself to be alert, so I call my own name 'bokuju' loudly and moment I can 'yes, I am here'.. all the thinking and anxiety disappears."When bokuju got old, in his last days for two or three years, he never called out his own name. Disciple asked, "Master you used to say your name all the time but now, you never do this. why so?"Bokuju replied, "Because bokuju is always here. he is always there, there for there is no need to call him. previously anxiety would take me, cloud all over me. so I had to call 'bokuju' and that moment anxiety would disappear." 
You have to come to deep knowing of your own self and mechanism of inner working. If you become alert, anxiety will disappear. 